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Indian Journal of Chemical Technology (IJCT) >
IJCT Vol.17 [2010] >
IJCT Vol.17(5) [September 2010] >
| Title: | Equilibrium and kinetic studies for Cd(II) adsorption from aqueous solution on Terminalia catappa Linn leaf powder biosorbent |
| Authors: | Rao, K S |
| Keywords: | Terminalia catappa Linn leaf powder
Cadmium(II)
Adsorption
Kinetics
Isotherms |
| Issue Date: | Sep-2010 |
| Publisher: | NISCAIR-CSIR, India |
| Abstract: | Terminalia catappa Linn,(TCL) leaf (almond leaf) powder
was tested as a biosorbent in a batch adsorption system. The samples with and without Cd(II) adsorption were characterized
using FTIR and SEM-EPMA techniques. Loading of Cd(II) onto to TCL powder
resulted in shift of various band positions (5 to 51 cm-1) in the
FTIR spectrum. The EPMA of Cd(II) loaded powder showed that Cd(II) was not
uniformly distributed on the surface but only on specific sites. The experimental parameters
chosen for adsorption studies were: pH (2.0 to 6.0), contact time (5 to 120
min), adsorbate concentration (50 to 500 mg L-1), adsorbent
concentration (0.25 to 5.0 g
per 50 mL adsorbate), anions and Pb(II) concentration. With the increase in pH
from 2.0 to 4.0, Cd(II) adsorption increased from 0.86 to 13.79 mg g-1
and with the further increase in pH to 5.5 only marginal increase to 14.12 mg g-1
was observed. Presence of chloride, sulphate or Pb(II) adversely affected
Cd(II) adsorption onto TCL. The kinetics of adsorption could be best described
by the pseudo-second-order equation. The
three equilibrium models namely, Langmuir, Freundlich and Redlich-Peterson
fitted well to the isothermic experimental data for TCL with regression
coefficients of > 0.97. The maximum uptake capacity of the biosorbent
was estimated to be 35.83 mg g-1. |
| Page(s): | 329-336 |
| CC License: |  CC Attribution-Noncommercial-No Derivative Works 2.5 India |
| ISSN: | 0975-0991 (Online); 0971-457X (Print) |
| Source: | IJCT Vol.17(5) [September 2010]
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